Bullfix Heavy Duty Plasterboard Fixings are a revolutionary way of hanging heavy objects to plasterboard, including TV brackets, boilers, radiators, shelves and cupboards. They are strong because of their smart and reliable patented wing design, which easily hook behind any plasterboard, including Stud walls, Dot and Dab, and Insulated plasterboard. (between 12.5mm and 16mm thickness) and only 19mm cavity is required. This pack provides fixings and screws for ease of installation.